First of all, slow down. That’s really the easiest way to save gas. Cars get their best mileage around 60 mph, which is part of why we use less gas on the freeway, so going 80 isn’t doing you any favors. Plus, when you’re going slower, you don’t need to brake as hard or suddenly—another thing that uses up a lot of fuel.

You should also keep in mind that rolling your windows down at speeds under 45 mph is better than using air conditioning, but as soon as you get up above that, the AC is more efficient than having the windows down because the drag from the wind reduces aerodynamics.

Don’t idle when you can help it, so avoid left turns even if it takes you a bit out of the way.